Define conversion of prometheus native histograms to OpenTelemetry exponential histograms #4561
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krajorama
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| @@ -131,6 +132,29 @@ Multiple Prometheus histogram metrics MUST be merged together into a single OTLP | |||
| * If `_count` is not present, the metric MUST be dropped. | |||
| * If `_sum` is not present, the histogram's sum MUST be unset. | |||
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| ### Native Histograms | |||
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The spec says this about native histograms at the top:
Exponential (Native) Histograms are not currently supported in the Prometheus text exposition format or the OpenMetrics text or proto formats.
Exponential (Native) Histograms SHOULD be dropped if they are not supported, or MAY be converted to fixed-bucket histograms.
You might want to change it.
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Has this actually changed? I know there was a proposed text format, but wasn't sure if that was implemented yet.
…ponential histograms
Co-authored-by: George Krajcsovits <krajorama@users.noreply.github.com>
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Part of #4494
Changes
This conversion is the inverse of the exp -> native conversion defined here: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/compatibility/prometheus_and_openmetrics.md#exponential-histograms.
CHANGELOG.mdfile updated for non-trivial changes@open-telemetry/prometheus-interoperability @ywwg @krajorama